SIRIUS XM - retrieving the real cover art?

So the sirius plugin on LMS doesn't seem to return actual art for the current track - but instead returns the channels artwork (i.e. coffeehouse).

There is a way to get it (the SONOS player does it and the Sirius web interface does it).

I notice some interesting tags returned by CLI - such as remoteMETA:HASH(0xXXXXXXX) and an id:-173515124.

I wonder if there is some url that can be called with a parameter to return said artwork?

Anyone have any ideas?

Pandora works a treat by the way.